N User 0.5 released

N User version 0.5 is released. The major improvement of this release is stability because the code has been rewritten and is now clean. The programming language is now the D because it is a modern object-oriented language.

N User is able to add and remove groups to users, but still cannot create or delete users and groups. It will be implemented in the future.

This release has been tested, I didn't found any bug, but of course some may remain. Please report it if you find one.